arnavarora2004 commented on code in PR #35696:
URL: https://github.com/apache/beam/pull/35696#discussion_r2240475538
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sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigtable/BigtableReadSchemaTransformProvider.java:
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@@ -152,45 +165,87 @@ public PCollectionRowTuple expand(PCollectionRowTuple
input) {
.withInstanceId(configuration.getInstanceId())
.withProjectId(configuration.getProjectId()));
+ Schema outputSchema =
+ Boolean.FALSE.equals(configuration.getFlatten()) ? ROW_SCHEMA :
FLATTENED_ROW_SCHEMA;
+
PCollection<Row> beamRows =
- bigtableRows.apply(MapElements.via(new
BigtableRowToBeamRow())).setRowSchema(ROW_SCHEMA);
+ bigtableRows
+ .apply("ConvertToBeamRows", ParDo.of(new
BigtableRowConverterDoFn(configuration)))
+ .setRowSchema(outputSchema);
return PCollectionRowTuple.of(OUTPUT_TAG, beamRows);
}
}
- public static class BigtableRowToBeamRow extends
SimpleFunction<com.google.bigtable.v2.Row, Row> {
- @Override
- public Row apply(com.google.bigtable.v2.Row bigtableRow) {
- // The collection of families is represented as a Map of column families.
- // Each column family is represented as a Map of columns.
- // Each column is represented as a List of cells
- // Each cell is represented as a Beam Row consisting of value and
timestamp_micros
- Map<String, Map<String, List<Row>>> families = new HashMap<>();
-
- for (Family fam : bigtableRow.getFamiliesList()) {
- // Map of column qualifier to list of cells
- Map<String, List<Row>> columns = new HashMap<>();
- for (Column col : fam.getColumnsList()) {
- List<Row> cells = new ArrayList<>();
- for (Cell cell : col.getCellsList()) {
- Row cellRow =
- Row.withSchema(CELL_SCHEMA)
- .withFieldValue("value",
ByteBuffer.wrap(cell.getValue().toByteArray()))
- .withFieldValue("timestamp_micros",
cell.getTimestampMicros())
+ /**
+ * A {@link DoFn} that converts a Bigtable {@link
com.google.bigtable.v2.Row} to a Beam {@link
+ * Row}. It supports both a nested representation and a flattened
representation where each column
+ * becomes a separate output element.
+ */
+ private static class BigtableRowConverterDoFn extends
DoFn<com.google.bigtable.v2.Row, Row> {
+ private final BigtableReadSchemaTransformConfiguration configuration;
+
+ BigtableRowConverterDoFn(BigtableReadSchemaTransformConfiguration
configuration) {
+ this.configuration = configuration;
+ }
+
+ @ProcessElement
+ public void processElement(
+ @Element com.google.bigtable.v2.Row bigtableRow, OutputReceiver<Row>
out) {
Review Comment:
implemented,
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